10931756557 has 4 divisors (see below), whose sum is σ = 10931969980. Its totient is φ = 10931543136.

The previous prime is 10931756501. The next prime is 10931756581. The reversal of 10931756557 is 75565713901.

It is a happy number.

10931756557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75565713901 = 601 ⋅125733301.

It can be written as a sum of positive squares in 2 ways, for example, as 2772970281 + 8158786276 = 52659^2 + 90326^2 .

It is a 3-Lehmer number, since φ(10931756557) divides (10931756557-1)³.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10931756557 is a prime.

It is a deceptive number, since it divides R_10931756556.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 10931756557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10931756357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21343 + ... + 149395.

It is an arithmetic number, because the mean of its divisors is an integer number (2732992495).

Almost surely, 2^10931756557 is an apocalyptic number.

10931756557 is the 85369-th pentagonal number.

It is an amenable number.

10931756557 is a deficient number, since it is larger than the sum of its proper divisors (213423).

10931756557 is an equidigital number, since it uses as much as digits as its factorization.

10931756557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213422.

The product of its (nonzero) digits is 992250, while the sum is 49.

The spelling of 10931756557 in words is "ten billion, nine hundred thirty-one million, seven hundred fifty-six thousand, five hundred fifty-seven".